Dear T,
Sorry for the sobbing patheticness of the last 10 minutes of the session. Thanks for being compassionate and understanding about it. And for saying you have confidence I'll get through it. And reiterating that you'll be checking/replying to email.

I'll miss you (at least I didn't say that out loud, though it was obvious, but would have felt terribly awkward because of course you wouldn't say you'd miss me, too). But I do genuinely hope you have a fun and relaxing time.
Love,
LT